Environmental policy integration (EPI) – as required under the EC Treaty – involves a continual process to ensure environmental issues are reflected in all policymaking. This generally demands changes in political, organisational and procedural activities, so that environmental issues are taken on board as early as possible and continuing during implementation. The product of EPI should be an overall improvement in policy and its implementation, in line with sustainable development needs. During 2004 IEEP provided support to the European Environment Agency in Copenhagen on a range of issues associated with environmental policy integration. The project resulted in this report on environmental policy integration in Europe, which reviews the state of play and suggests a new framework for evaluating progress across sectors and countries.